<%@ page import="java.sql.Statement" %>
<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.sql.ResultSet" %>
<%@ page import="java.util.List" %>
<%@ page import="edu.sctu.User" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title></title>
</head>
<body>

<jsp:include page="header.jsp"/>



<%

//    if( session.getAttribute("a") == null)
//        response.sendRedirect("login.jsp");

//    int a;
//
//    a = 10;
//    // out ,request
//
//    out.write("hello,world!");
//    out.write("<h1> hello </h1>");

%>


<style type="text/css">

    table {

        border-collapse: collapse;
    }

    td {

        border: 1px solid #000;
        padding: 10px;
    }
</style>

<table>
    <tr>
        <td>编号</td>
        <td>姓名</td>
        <td>密码</td>
        <td>操作1</td>
        <td>操作2</td>
    </tr>


    <%






        List<User> userList = new ArrayList<>();

        // 3+1
        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;

        // t_users
        String sql = "select * from t_users";

        Class.forName("com.mysql.jdbc.Driver");

        connection = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/sctu_javaweb_2018",
                "root",
                "sctu123456"
        );

        statement = connection.createStatement();

        resultSet = statement.executeQuery(sql);

        while(resultSet.next()){


            int id = resultSet.getInt(1);
            String username = resultSet.getString(2);
            String password = resultSet.getString(3);

            // 封装
            User user = new User();
            user.setId(id);
            user.setName(username);
            user.setPassword(password);

            userList.add(user);
        }

        resultSet.close();
        statement.close();
        connection.close();

//        edu.sctu.User john = new edu.sctu.User();
//        john.id = 1;
//        john.username = "john";
//        john.password = "123";
//        userList.add(john);
//
//        edu.sctu.User chen = new edu.sctu.User();
//        chen.id = 2;
//        chen.username = "chen";
//        chen.password = "abcccc";
//        userList.add(chen);

        // 字符串和变量的连接操作
        // 221
        // 2个双引号
        // 2个+号
        // 1个变量

//        for (int i = 0; i < 10; i++) {
//
//            out.write("<tr><td>"+i+"</td><td>John</td><td>123</td></tr>");
//        }
        for (User user : userList) {

            out.write("<tr><td>" + user.getId() +
                    "</td><td>" + user.getName() +
                    "</td><td>" + user.getPassword() +
                    "</td><td>" +
                    "<a href='deleteUserHandler.jsp?id="
                    +user.getId()+"'>删除</a></td>" +
                    "<td><a href='updateUser.jsp?id="+user.getId()+"&username="+user.getName()+"&password="+user.getPassword()+"'>更新</a></td></tr>");
        }

    %>


</table>



<%@include file="footer.jsp"%>

</body>
</html>
